metamorphic
Pink quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂), with iron-oxide and other impurities
AI-generated identification · may be incorrectHardness about 7 Mohs; pink to reddish-brown, granular and sugary texture, generally dull to vitreous luster, massive structure, and no prominent cleavage. Its rounded, smoothed form indicates natural water wear or tumbling.
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Physical properties
Hardness about 7 Mohs; pink to reddish-brown, granular and sugary texture, generally dull to vitreous luster, massive structure, and no prominent cleavage. Its rounded, smoothed form indicates natural water wear or tumbling.
Formation & geological history
Formed when quartz-rich sandstone recrystallized under heat and pressure, commonly during Precambrian or younger mountain-building events; the exact age cannot be determined from the image. Iron oxides or feldspar likely produce the pink coloration.
Uses & applications
Used as crushed stone, aggregate, paving and decorative stone; attractive pieces are collected or used as lapidary material, though this example appears ordinary rather than gem-grade.
Geological facts
Quartzite is typically more resistant than its parent sandstone and often forms durable ridges and resistant stream cobbles.
Field identification & locations
Identify it by its granular quartz texture, hardness, and lack of visible sand grains or bedding; it should scratch ordinary glass and resist steel. Common in metamorphic mountain belts and gravel beds worldwide.
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